You can expect to pay about 30 more for a bi directional knife gate valve.
Bidirectional vs unidirectional knife gate valve.
Unidirectional knife gate valves seat on just one side.
The series 940 unidirectional knife gate valve features a single piece cast body design offers rugged performance in applications ranging from general purpose to severe media handling available with integral metal or replaceable soft seat the series 940 gate valve is easily automated for on off applications.
The biggest difference is price.
The uni directional knife gate valve can also be used in harsh aggressive environments high temperatures.
Bi directional knife gate valves will seat on either side of the gate and operate with back pressures providing adequate water tightness and has a tendency of avoiding any build up of solids that could prevent the valve from closing.
Knife gate valve seat options include metal seat and resilient seat which can be offered as unidirectional and bidirectional.
Bi directional knife gate valves will seat on either side.
So you re probably wondering why don t i skip the confusion and just install all bidirectional knife gates.
Designed for easy quick conversion between manual and pneumatic actuation.
The bray series 752 bidirectional knife gate valve features a robust steel reinforced perimeter seat which provides bidirectional zero leakage shutoff.